Anthony Bernal, a top aide to President Biden, has declined to testify before a committee led by House Republicans on Thursday. The committee was investigating allegations of covering up the president’s cognitive decline during his time in office.

Bernal, known as first lady Jill Biden’s “work husband” and a loyal member of the family’s inner circle, flouted an invitation to sit for a transcribed interview with the House Oversight Committee after the Trump White House waived executive privilege for the testimony.

“With no privilege left to hide behind, Mr. Bernal is now running scared, desperate to bury the truth,” said Oversight chairman James Comer (R-Ky.)

“The American people deserve answers and accountability, and the Oversight Committee will not tolerate this obstruction. I will promptly issue a subpoena to compel Anthony Bernal’s testimony before the Committee.”

Bernal’s move comes after former White House Domestic Policy Council director Neera Tanden testified to the Oversight panel on Tuesday, without the shield of privilege covering her statements.